NUTRITIVE SOLUTIONS 22J 



1.5 g. sodium chloride. 



1.5 g. neutral potassium phosphate. 



600 cc. distilled water. 



Solution Lacking Potassium. " 

 7 g. calcium nitrate. 

 1.5 g. magnesium sulphate. 

 1.5 g. sodium chloride. 



1 . 5 g. neutral sodium phosphate, or calcium phosphate in excess. 

 600 cc. distilled water. 



Solution Lacking Magnesium. 

 6 g. calcium nitrate. 



1.5 g. potassium nitrate. 



1.5 g. neutral potassium phosphate. 



1.2 g. potassium sulphate or an excess of calcium phosphate. 

 600 cc. distilled water. 



Solution Lacking Nitrates. " 

 1.5 g. neutral potassium phosphate. 

 1.5 g. magnesium phosphate. 

 1.5 g. potassium chloride, t-' 

 600 cc. distilled water. 



Solution Lacking Phosphates. 

 0.5 g. potassium nitrate. 

 1 g. calcium nitrate. 

 0.5 g. magnesium nitrate. 

 0.5 g. neutral potassium sulphate. 

 1,000 cc. distilled water. 

 This solution is to be used without the addition of more water. 



A drop of solution of iron chloride should be added to the 

 culture jar every time^ it is filled or refilled. The chemicals used 

 should be absolutely pure. A daily aeration of the solutions in 

 the jars by means of a blower attached to a water tap, or an as- 

 pirator will be an advantage (Figs. 92, and 1 11). The solutions 



in the stock bottles should be well shaken up before the necessary 

 16 



